28 • Chapter 3 Connecting Hardware DMC-1000
FLE,RLE,HOMEE
FLF,RLF,HOMEF
FLG,RLG,HOMEG
FLH,RLH,HOMEH
LSCOM
A logic zero is generated when at least 1mA of current flows from the common signal to the input. A
positive voltage (with respect to the input) must be supplied at the common. This can be accomplished
by connecting a voltage in the range of +5V to +28V into INCOM of the input circuitry from a
separate power supply
LSCOM
FLSX
RLSX
HOMEX
FLSY
RLSY
HOMEY
INCOM
IN1 IN2 IN3 IN4 IN5 IN6
IN7 IN8 ABORT
Figure 3-1. The Optoisolated Inputs
Using an Isolated Power Supply
To take full advantage of opto-isolation, an isolated power supply should be used to provide the
voltage at the input common connection. When using an isolated power supply, do not connect the
ground of the isolated power to the ground of the controller. A power supply in the voltage range
between 5 to 28 Volts may be applied directly (see Figure 3-2). For voltages greater than 28 Volts, a
resistor, R, is needed in series with the input such that
1 mA < V supply/(R + 2.2K
Ω) < 15 mA
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